Submitted on: 09 January 2011.
Revised on: 15 February 2011.
Accepted on: 05 March 2011.
Review of Quantitative Finance and Accounting
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Submitted on: 01 May 2004.
Revised on: 09 June 2004.
Accepted on: 27 June 2004.
Review of Quantitative Finance and Accounting
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